在Javascript中从嵌套数组对象中生成扁平值的数组

function flattenArray(arr) {
  let result = [];
  arr.forEach(item => {
    if (Array.isArray(item)) {
      result = result.concat(flattenArray(item));
    } else if (typeof item === 'object') {
      result = result.concat(Object.values(item));
    } else {
      result.push(item);
    }
  });
  return result;
}

const nestedArray = [
  1,
  [2, 3],
  {
    a: 4,
    b: [5, 6],
    c: {
      d: 7
    }
  },
  8
];

const flattenedArray = flattenArray(nestedArray);
console.log(flattenedArray);

const flattenArray = arr => arr.flatMap(item =>
  Array.isArray(item) ? flattenArray(item) : item
);

const nestedArray = [
  1,
  [2, 3],
  {
    a: 4,
    b: [5, 6],
    c: {
      d: 7
    }
  },
  8
];

const flattenedArray = flattenArray(nestedArray);
console.log(flattenedArray);